VGA, short for video graphics array, is an interface between
a computer and monitor that was widely used before the DVI standard was
developed. Introduced by IBM on its PS/2 line in 1987, VGA quickly took the
place of the earlier digital CGA and EGA interfaces and enjoyed great
popularity among consumers because of its higher resolution and more colors.
Generally speaking, VGA systems provide a resolution of 720 by 400 pixels in
text mode. Moreover, the resolution is either 640 by 480 (with 16 colors) or
320 by 200 (with 256 colors) in graphics mode. In total, the palette of colors
can reach 262,144.
VGA uses analog signals instead of digital signals, which can
distinguish it from the earlier graphics standard for PCs, for example, MDA,
CGA, and EGA. Older CRTs used VGA, and flat LCD panels typically have both
analog VGA and DVI digital. However, as a matter of fact, chances are that some
newer PCs are not compatible with VGA interfaces because their monitors are
designed for one of the older standards. As a result, VGA is not usable in such
systems.
With the rapid development of science and technology, an
increasing amount of new and high-tech devices have emerged, which poses some
kind of threat to VGA. Those newer devices will provide consumers with greater
resolution and more colors. For instance, SVGA, a 8514/A graphics standard, and
XGA are mode advanced and easy to utilize. Nonetheless, VGA has always remained
the lowest common denominator. Actually, all PCs manufacturers produce today
are compatible with VGA. Therefore, you have no need to worry that your
computer would fail to work once installed VGA. Although VGA may be not as
advanced and versatile as the newly emerged devices, it is still very helpful
and powerful.
